Located within areas of special flood hazard are areas designated as floodways or regulatory floodways. The floodway is an extremely hazardous area due to the velocity of floodwaters carrying debris and potential projectiles, and the potential for erosion within the floodway:
A. Floodway encroachments are prohibited unless certification by the applicant's registered professional engineer or architect is provided demonstrating through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the encroachment would not result in any increase in flood levels during the occurrence of the base flood discharge.
B. If Subsection A is satisfied, all floodway encroachments shall comply with all applicable flood hazard reduction provisions of section 15-26-8, "Development Standards".
C. If the floodway has not been designated, no new construction, substantial improvement, or other development (including fill) shall be permitted within zones A1-30, AE, and AH as shown on the FIRM, unless it is demonstrated that the cumulative effect of the proposed development, when combined with all other existing and anticipated development, will not increase the water surface elevation of the base flood more than one foot (1') at any point within the city.
D. Notwithstanding any other provision of this chapter, if the city first applies for a conditional FIRM and floodway revision, fulfills the requirements for such revision as established under the provisions of 44 CFR 65.12, and receives the approval of the federal insurance administrator, a floodway encroachment that would result in an increase in BFEs may be permitted.
(Ord. 2015-21, 5-26-2015; amd. Ord. 2023-61, 11-14-2023)